研究目的
Investigating the preparation, microstructure, and microhardness of selective laser-melted W–3Ta sample to overcome the processing difficulties of tungsten alloy due to its high melting point.
研究成果
The study successfully fabricated refractory W–3Ta alloy samples with high content of W by SLM, achieving a maximum relative density of 95.79% under optimal VED. The W–3Ta alloy exhibited a smooth surface morphology, W–Ta substitutional solid solution phase, and higher microhardness than traditionally fabricated samples. The findings highlight the potential of SLM for processing tungsten alloys with complex microstructures and architectures.
研究不足
The study acknowledges that process parameter investigations are still required to reduce pores and cracks and achieve nearly full density SLM W-based alloy. The intrinsic brittleness of tungsten and high ductile–brittle transition temperature (DBTT) pose challenges in processing.
1：Experimental Design and Method Selection:
The study utilized selective laser melting (SLM) to fabricate W–3Ta samples, focusing on the effects of volumetric energy density (VED) on surface morphology, relative density, microstructure, phase composition, and microhardness.
2：Sample Selection and Data Sources:
W–3Ta composite powder was prepared by coating micron W particles with submicron Ta powder particles. Samples were fabricated with dimensions of 10 × 10 × 5 mm.
3：List of Experimental Equipment and Materials:
SLM 280HL (SLM solutions, Germany) for sample preparation, optical microscope (Nikon MA 200) for cross-section morphology observation, SEM (Hitachi S4800) for surface morphology and microstructure observation, EBSD system for grain orientation analysis, X-ray diffraction (Bruker D8 Advance A25) for phase composition identification, and digital microhardness measurement system (MH-5) for microhardness measurement.
4：Experimental Procedures and Operational Workflow:
The SLM chamber was filled with argon to prevent oxidation. The stainless-steel substrate was preheated at 150 °C. The scan strategy involved rotating the scanning direction by 67° between neighbor layers. Process parameters included laser power, scan speed, and hatch distance.
5：Data Analysis Methods:
Relative density was measured via image analysis. Microhardness was measured at five points per sample to calculate average hardness. EBSD data were analyzed with Channel 5 software.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
